1/* Copyright (c) 2018, Mellanox Technologies All rights reserved. 2 * 3 * This software is available to you under a choice of one of two 4 * licenses. You may choose to be licensed under the terms of the GNU 5 * General Public License (GPL) Version 2, available from the file 6 * COPYING in the main directory of this source tree, or the 7 * OpenIB.org BSD license below: 8 * 9 * Redistribution and use in source and binary forms, with or 10 * without modification, are permitted provided that the following 11 * conditions are met: 12 * 13 * - Redistributions of source code must retain the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer. 16 * 17 * - Redistributions in binary form must reproduce the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer in the documentation and/or other materials 20 * provided with the distribution. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 23 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 25 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 26 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 27 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 28 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 29 * SOFTWARE. 30 */ 31 32#include <crypto/aead.h> 33#include <linux/highmem.h> 34#include <linux/module.h> 35#include <linux/netdevice.h> 36#include <net/dst.h> 37#include <net/inet_connection_sock.h> 38#include <net/tcp.h> 39#include <net/tls.h> 40 41#include "tls.h" 42#include "trace.h" 43 44/* device_offload_lock is used to synchronize tls_dev_add 45 * against NETDEV_DOWN notifications. 46 */ 47static DECLARE_RWSEM(device_offload_lock); 48 49static struct workqueue_struct *destruct_wq __read_mostly; 50 51static LIST_HEAD(tls_device_list); 52static LIST_HEAD(tls_device_down_list); 53static DEFINE_SPINLOCK(tls_device_lock); 54 55static struct page *dummy_page; 56 57static void tls_device_free_ctx(struct tls_context *ctx) 58{ 59 if (ctx->tx_conf == TLS_HW) 60 kfree(tls_offload_ctx_tx(ctx)); 61 62 if (ctx->rx_conf == TLS_HW) 63 kfree(tls_offload_ctx_rx(ctx)); 64 65 tls_ctx_free(NULL, ctx); 66} 67 68static void tls_device_tx_del_task(struct work_struct *work) 69{ 70 struct tls_offload_context_tx *offload_ctx = 71 container_of(work, struct tls_offload_context_tx, destruct_work); 72 struct tls_context *ctx = offload_ctx->ctx; 73 struct net_device *netdev; 74 75 /* Safe, because this is the destroy flow, refcount is 0, so 76 * tls_device_down can't store this field in parallel. 77 */ 78 netdev = rcu_dereference_protected(ctx->netdev, 79 !refcount_read(&ctx->refcount)); 80 81 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, TLS_OFFLOAD_CTX_DIR_TX); 82 dev_put(netdev); 83 ctx->netdev = NULL; 84 tls_device_free_ctx(ctx); 85} 86 87static void tls_device_queue_ctx_destruction(struct tls_context *ctx) 88{ 89 struct net_device *netdev; 90 unsigned long flags; 91 bool async_cleanup; 92 93 spin_lock_irqsave(&tls_device_lock, flags); 94 if (unlikely(!refcount_dec_and_test(&ctx->refcount))) { 95 spin_unlock_irqrestore(&tls_device_lock, flags); 96 return; 97 } 98 99 list_del(&ctx->list); /* Remove from tls_device_list / tls_device_down_list */ 100 101 /* Safe, because this is the destroy flow, refcount is 0, so 102 * tls_device_down can't store this field in parallel. 103 */ 104 netdev = rcu_dereference_protected(ctx->netdev, 105 !refcount_read(&ctx->refcount)); 106 107 async_cleanup = netdev && ctx->tx_conf == TLS_HW; 108 if (async_cleanup) { 109 struct tls_offload_context_tx *offload_ctx = tls_offload_ctx_tx(ctx); 110 111 /* queue_work inside the spinlock 112 * to make sure tls_device_down waits for that work. 113 */ 114 queue_work(destruct_wq, &offload_ctx->destruct_work); 115 } 116 spin_unlock_irqrestore(&tls_device_lock, flags); 117 118 if (!async_cleanup) 119 tls_device_free_ctx(ctx); 120} 121 122/* We assume that the socket is already connected */ 123static struct net_device *get_netdev_for_sock(struct sock *sk) 124{ 125 struct dst_entry *dst = sk_dst_get(sk); 126 struct net_device *netdev = NULL; 127 128 if (likely(dst)) { 129 netdev = netdev_sk_get_lowest_dev(dst->dev, sk); 130 dev_hold(netdev); 131 } 132 133 dst_release(dst); 134 135 return netdev; 136} 137 138static void destroy_record(struct tls_record_info *record) 139{ 140 int i; 141 142 for (i = 0; i < record->num_frags; i++) 143 __skb_frag_unref(&record->frags[i], false); 144 kfree(record); 145} 146 147static void delete_all_records(struct tls_offload_context_tx *offload_ctx) 148{ 149 struct tls_record_info *info, *temp; 150 151 list_for_each_entry_safe(info, temp, &offload_ctx->records_list, list) { 152 list_del(&info->list); 153 destroy_record(info); 154 } 155 156 offload_ctx->retransmit_hint = NULL; 157} 158 159static void tls_icsk_clean_acked(struct sock *sk, u32 acked_seq) 160{ 161 struct tls_context *tls_ctx = tls_get_ctx(sk); 162 struct tls_record_info *info, *temp; 163 struct tls_offload_context_tx *ctx; 164 u64 deleted_records = 0; 165 unsigned long flags; 166 167 if (!tls_ctx) 168 return; 169 170 ctx = tls_offload_ctx_tx(tls_ctx); 171 172 spin_lock_irqsave(&ctx->lock, flags); 173 info = ctx->retransmit_hint; 174 if (info && !before(acked_seq, info->end_seq)) 175 ctx->retransmit_hint = NULL; 176 177 list_for_each_entry_safe(info, temp, &ctx->records_list, list) { 178 if (before(acked_seq, info->end_seq)) 179 break; 180 list_del(&info->list); 181 182 destroy_record(info); 183 deleted_records++; 184 } 185 186 ctx->unacked_record_sn += deleted_records; 187 spin_unlock_irqrestore(&ctx->lock, flags); 188} 189 190/* At this point, there should be no references on this 191 * socket and no in-flight SKBs associated with this 192 * socket, so it is safe to free all the resources. 193 */ 194void tls_device_sk_destruct(struct sock *sk) 195{ 196 struct tls_context *tls_ctx = tls_get_ctx(sk); 197 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); 198 199 tls_ctx->sk_destruct(sk); 200 201 if (tls_ctx->tx_conf == TLS_HW) { 202 if (ctx->open_record) 203 destroy_record(ctx->open_record); 204 delete_all_records(ctx); 205 crypto_free_aead(ctx->aead_send); 206 clean_acked_data_disable(inet_csk(sk)); 207 } 208 209 tls_device_queue_ctx_destruction(tls_ctx); 210} 211EXPORT_SYMBOL_GPL(tls_device_sk_destruct); 212 213void tls_device_free_resources_tx(struct sock *sk) 214{ 215 struct tls_context *tls_ctx = tls_get_ctx(sk); 216 217 tls_free_partial_record(sk, tls_ctx); 218} 219 220void tls_offload_tx_resync_request(struct sock *sk, u32 got_seq, u32 exp_seq) 221{ 222 struct tls_context *tls_ctx = tls_get_ctx(sk); 223 224 trace_tls_device_tx_resync_req(sk, got_seq, exp_seq); 225 WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags)); 226} 227EXPORT_SYMBOL_GPL(tls_offload_tx_resync_request); 228 229static void tls_device_resync_tx(struct sock *sk, struct tls_context *tls_ctx, 230 u32 seq) 231{ 232 struct net_device *netdev; 233 struct sk_buff *skb; 234 int err = 0; 235 u8 *rcd_sn; 236 237 skb = tcp_write_queue_tail(sk); 238 if (skb) 239 TCP_SKB_CB(skb)->eor = 1; 240 241 rcd_sn = tls_ctx->tx.rec_seq; 242 243 trace_tls_device_tx_resync_send(sk, seq, rcd_sn); 244 down_read(&device_offload_lock); 245 netdev = rcu_dereference_protected(tls_ctx->netdev, 246 lockdep_is_held(&device_offload_lock)); 247 if (netdev) 248 err = netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, 249 rcd_sn, 250 TLS_OFFLOAD_CTX_DIR_TX); 251 up_read(&device_offload_lock); 252 if (err) 253 return; 254 255 clear_bit_unlock(TLS_TX_SYNC_SCHED, &tls_ctx->flags); 256} 257 258static void tls_append_frag(struct tls_record_info *record, 259 struct page_frag *pfrag, 260 int size) 261{ 262 skb_frag_t *frag; 263 264 frag = &record->frags[record->num_frags - 1]; 265 if (skb_frag_page(frag) == pfrag->page && 266 skb_frag_off(frag) + skb_frag_size(frag) == pfrag->offset) { 267 skb_frag_size_add(frag, size); 268 } else { 269 ++frag; 270 skb_frag_fill_page_desc(frag, pfrag->page, pfrag->offset, 271 size); 272 ++record->num_frags; 273 get_page(pfrag->page); 274 } 275 276 pfrag->offset += size; 277 record->len += size; 278} 279 280static int tls_push_record(struct sock *sk, 281 struct tls_context *ctx, 282 struct tls_offload_context_tx *offload_ctx, 283 struct tls_record_info *record, 284 int flags) 285{ 286 struct tls_prot_info *prot = &ctx->prot_info; 287 struct tcp_sock *tp = tcp_sk(sk); 288 skb_frag_t *frag; 289 int i; 290 291 record->end_seq = tp->write_seq + record->len; 292 list_add_tail_rcu(&record->list, &offload_ctx->records_list); 293 offload_ctx->open_record = NULL; 294 295 if (test_bit(TLS_TX_SYNC_SCHED, &ctx->flags)) 296 tls_device_resync_tx(sk, ctx, tp->write_seq); 297 298 tls_advance_record_sn(sk, prot, &ctx->tx); 299 300 for (i = 0; i < record->num_frags; i++) { 301 frag = &record->frags[i]; 302 sg_unmark_end(&offload_ctx->sg_tx_data[i]); 303 sg_set_page(&offload_ctx->sg_tx_data[i], skb_frag_page(frag), 304 skb_frag_size(frag), skb_frag_off(frag)); 305 sk_mem_charge(sk, skb_frag_size(frag)); 306 get_page(skb_frag_page(frag)); 307 } 308 sg_mark_end(&offload_ctx->sg_tx_data[record->num_frags - 1]); 309 310 /* all ready, send */ 311 return tls_push_sg(sk, ctx, offload_ctx->sg_tx_data, 0, flags); 312} 313 314static void tls_device_record_close(struct sock *sk, 315 struct tls_context *ctx, 316 struct tls_record_info *record, 317 struct page_frag *pfrag, 318 unsigned char record_type) 319{ 320 struct tls_prot_info *prot = &ctx->prot_info; 321 struct page_frag dummy_tag_frag; 322 323 /* append tag 324 * device will fill in the tag, we just need to append a placeholder 325 * use socket memory to improve coalescing (re-using a single buffer 326 * increases frag count) 327 * if we can't allocate memory now use the dummy page 328 */ 329 if (unlikely(pfrag->size - pfrag->offset < prot->tag_size) && 330 !skb_page_frag_refill(prot->tag_size, pfrag, sk->sk_allocation)) { 331 dummy_tag_frag.page = dummy_page; 332 dummy_tag_frag.offset = 0; 333 pfrag = &dummy_tag_frag; 334 } 335 tls_append_frag(record, pfrag, prot->tag_size); 336 337 /* fill prepend */ 338 tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]), 339 record->len - prot->overhead_size, 340 record_type); 341} 342 343static int tls_create_new_record(struct tls_offload_context_tx *offload_ctx, 344 struct page_frag *pfrag, 345 size_t prepend_size) 346{ 347 struct tls_record_info *record; 348 skb_frag_t *frag; 349 350 record = kmalloc(sizeof(*record), GFP_KERNEL); 351 if (!record) 352 return -ENOMEM; 353 354 frag = &record->frags[0]; 355 skb_frag_fill_page_desc(frag, pfrag->page, pfrag->offset, 356 prepend_size); 357 358 get_page(pfrag->page); 359 pfrag->offset += prepend_size; 360 361 record->num_frags = 1; 362 record->len = prepend_size; 363 offload_ctx->open_record = record; 364 return 0; 365} 366 367static int tls_do_allocation(struct sock *sk, 368 struct tls_offload_context_tx *offload_ctx, 369 struct page_frag *pfrag, 370 size_t prepend_size) 371{ 372 int ret; 373 374 if (!offload_ctx->open_record) { 375 if (unlikely(!skb_page_frag_refill(prepend_size, pfrag, 376 sk->sk_allocation))) { 377 READ_ONCE(sk->sk_prot)->enter_memory_pressure(sk); 378 sk_stream_moderate_sndbuf(sk); 379 return -ENOMEM; 380 } 381 382 ret = tls_create_new_record(offload_ctx, pfrag, prepend_size); 383 if (ret) 384 return ret; 385 386 if (pfrag->size > pfrag->offset) 387 return 0; 388 } 389 390 if (!sk_page_frag_refill(sk, pfrag)) 391 return -ENOMEM; 392 393 return 0; 394} 395 396static int tls_device_copy_data(void *addr, size_t bytes, struct iov_iter *i) 397{ 398 size_t pre_copy, nocache; 399 400 pre_copy = ~((unsigned long)addr - 1) & (SMP_CACHE_BYTES - 1); 401 if (pre_copy) { 402 pre_copy = min(pre_copy, bytes); 403 if (copy_from_iter(addr, pre_copy, i) != pre_copy) 404 return -EFAULT; 405 bytes -= pre_copy; 406 addr += pre_copy; 407 } 408 409 nocache = round_down(bytes, SMP_CACHE_BYTES); 410 if (copy_from_iter_nocache(addr, nocache, i) != nocache) 411 return -EFAULT; 412 bytes -= nocache; 413 addr += nocache; 414 415 if (bytes && copy_from_iter(addr, bytes, i) != bytes) 416 return -EFAULT; 417 418 return 0; 419} 420 421static int tls_push_data(struct sock *sk, 422 struct iov_iter *iter, 423 size_t size, int flags, 424 unsigned char record_type) 425{ 426 struct tls_context *tls_ctx = tls_get_ctx(sk); 427 struct tls_prot_info *prot = &tls_ctx->prot_info; 428 struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); 429 struct tls_record_info *record; 430 int tls_push_record_flags; 431 struct page_frag *pfrag; 432 size_t orig_size = size; 433 u32 max_open_record_len; 434 bool more = false; 435 bool done = false; 436 int copy, rc = 0; 437 long timeo; 438 439 if (flags & 440 ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | 441 MSG_SPLICE_PAGES | MSG_EOR)) 442 return -EOPNOTSUPP; 443 444 if ((flags & (MSG_MORE | MSG_EOR)) == (MSG_MORE | MSG_EOR)) 445 return -EINVAL; 446 447 if (unlikely(sk->sk_err)) 448 return -sk->sk_err; 449 450 flags |= MSG_SENDPAGE_DECRYPTED; 451 tls_push_record_flags = flags | MSG_MORE; 452 453 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); 454 if (tls_is_partially_sent_record(tls_ctx)) { 455 rc = tls_push_partial_record(sk, tls_ctx, flags); 456 if (rc < 0) 457 return rc; 458 } 459 460 pfrag = sk_page_frag(sk); 461 462 /* TLS_HEADER_SIZE is not counted as part of the TLS record, and 463 * we need to leave room for an authentication tag. 464 */ 465 max_open_record_len = TLS_MAX_PAYLOAD_SIZE + 466 prot->prepend_size; 467 do { 468 rc = tls_do_allocation(sk, ctx, pfrag, prot->prepend_size); 469 if (unlikely(rc)) { 470 rc = sk_stream_wait_memory(sk, &timeo); 471 if (!rc) 472 continue; 473 474 record = ctx->open_record; 475 if (!record) 476 break; 477handle_error: 478 if (record_type != TLS_RECORD_TYPE_DATA) { 479 /* avoid sending partial 480 * record with type != 481 * application_data 482 */ 483 size = orig_size; 484 destroy_record(record); 485 ctx->open_record = NULL; 486 } else if (record->len > prot->prepend_size) { 487 goto last_record; 488 } 489 490 break; 491 } 492 493 record = ctx->open_record; 494 495 copy = min_t(size_t, size, max_open_record_len - record->len); 496 if (copy && (flags & MSG_SPLICE_PAGES)) { 497 struct page_frag zc_pfrag; 498 struct page **pages = &zc_pfrag.page; 499 size_t off; 500 501 rc = iov_iter_extract_pages(iter, &pages, 502 copy, 1, 0, &off); 503 if (rc <= 0) { 504 if (rc == 0) 505 rc = -EIO; 506 goto handle_error; 507 } 508 copy = rc; 509 510 if (WARN_ON_ONCE(!sendpage_ok(zc_pfrag.page))) { 511 iov_iter_revert(iter, copy); 512 rc = -EIO; 513 goto handle_error; 514 } 515 516 zc_pfrag.offset = off; 517 zc_pfrag.size = copy; 518 tls_append_frag(record, &zc_pfrag, copy); 519 } else if (copy) { 520 copy = min_t(size_t, copy, pfrag->size - pfrag->offset); 521 522 rc = tls_device_copy_data(page_address(pfrag->page) + 523 pfrag->offset, copy, 524 iter); 525 if (rc) 526 goto handle_error; 527 tls_append_frag(record, pfrag, copy); 528 } 529 530 size -= copy; 531 if (!size) { 532last_record: 533 tls_push_record_flags = flags; 534 if (flags & MSG_MORE) { 535 more = true; 536 break; 537 } 538 539 done = true; 540 } 541 542 if (done || record->len >= max_open_record_len || 543 (record->num_frags >= MAX_SKB_FRAGS - 1)) { 544 tls_device_record_close(sk, tls_ctx, record, 545 pfrag, record_type); 546 547 rc = tls_push_record(sk, 548 tls_ctx, 549 ctx, 550 record, 551 tls_push_record_flags); 552 if (rc < 0) 553 break; 554 } 555 } while (!done); 556 557 tls_ctx->pending_open_record_frags = more; 558 559 if (orig_size - size > 0) 560 rc = orig_size - size; 561 562 return rc; 563} 564 565int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) 566{ 567 unsigned char record_type = TLS_RECORD_TYPE_DATA; 568 struct tls_context *tls_ctx = tls_get_ctx(sk); 569 int rc; 570 571 if (!tls_ctx->zerocopy_sendfile) 572 msg->msg_flags &= ~MSG_SPLICE_PAGES; 573 574 mutex_lock(&tls_ctx->tx_lock); 575 lock_sock(sk); 576 577 if (unlikely(msg->msg_controllen)) { 578 rc = tls_process_cmsg(sk, msg, &record_type); 579 if (rc) 580 goto out; 581 } 582 583 rc = tls_push_data(sk, &msg->msg_iter, size, msg->msg_flags, 584 record_type); 585 586out: 587 release_sock(sk); 588 mutex_unlock(&tls_ctx->tx_lock); 589 return rc; 590} 591 592void tls_device_splice_eof(struct socket *sock) 593{ 594 struct sock *sk = sock->sk; 595 struct tls_context *tls_ctx = tls_get_ctx(sk); 596 struct iov_iter iter = {}; 597 598 if (!tls_is_partially_sent_record(tls_ctx)) 599 return; 600 601 mutex_lock(&tls_ctx->tx_lock); 602 lock_sock(sk); 603 604 if (tls_is_partially_sent_record(tls_ctx)) { 605 iov_iter_bvec(&iter, ITER_SOURCE, NULL, 0, 0); 606 tls_push_data(sk, &iter, 0, 0, TLS_RECORD_TYPE_DATA); 607 } 608 609 release_sock(sk); 610 mutex_unlock(&tls_ctx->tx_lock); 611} 612 613struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context, 614 u32 seq, u64 *p_record_sn) 615{ 616 u64 record_sn = context->hint_record_sn; 617 struct tls_record_info *info, *last; 618 619 info = context->retransmit_hint; 620 if (!info || 621 before(seq, info->end_seq - info->len)) { 622 /* if retransmit_hint is irrelevant start 623 * from the beginning of the list 624 */ 625 info = list_first_entry_or_null(&context->records_list, 626 struct tls_record_info, list); 627 if (!info) 628 return NULL; 629 /* send the start_marker record if seq number is before the 630 * tls offload start marker sequence number. This record is 631 * required to handle TCP packets which are before TLS offload 632 * started. 633 * And if it's not start marker, look if this seq number 634 * belongs to the list. 635 */ 636 if (likely(!tls_record_is_start_marker(info))) { 637 /* we have the first record, get the last record to see 638 * if this seq number belongs to the list. 639 */ 640 last = list_last_entry(&context->records_list, 641 struct tls_record_info, list); 642 643 if (!between(seq, tls_record_start_seq(info), 644 last->end_seq)) 645 return NULL; 646 } 647 record_sn = context->unacked_record_sn; 648 } 649 650 /* We just need the _rcu for the READ_ONCE() */ 651 rcu_read_lock(); 652 list_for_each_entry_from_rcu(info, &context->records_list, list) { 653 if (before(seq, info->end_seq)) { 654 if (!context->retransmit_hint || 655 after(info->end_seq, 656 context->retransmit_hint->end_seq)) { 657 context->hint_record_sn = record_sn; 658 context->retransmit_hint = info; 659 } 660 *p_record_sn = record_sn; 661 goto exit_rcu_unlock; 662 } 663 record_sn++; 664 } 665 info = NULL; 666 667exit_rcu_unlock: 668 rcu_read_unlock(); 669 return info; 670} 671EXPORT_SYMBOL(tls_get_record); 672 673static int tls_device_push_pending_record(struct sock *sk, int flags) 674{ 675 struct iov_iter iter; 676 677 iov_iter_kvec(&iter, ITER_SOURCE, NULL, 0, 0); 678 return tls_push_data(sk, &iter, 0, flags, TLS_RECORD_TYPE_DATA); 679} 680 681void tls_device_write_space(struct sock *sk, struct tls_context *ctx) 682{ 683 if (tls_is_partially_sent_record(ctx)) { 684 gfp_t sk_allocation = sk->sk_allocation; 685 686 WARN_ON_ONCE(sk->sk_write_pending); 687 688 sk->sk_allocation = GFP_ATOMIC; 689 tls_push_partial_record(sk, ctx, 690 MSG_DONTWAIT | MSG_NOSIGNAL | 691 MSG_SENDPAGE_DECRYPTED); 692 sk->sk_allocation = sk_allocation; 693 } 694} 695 696static void tls_device_resync_rx(struct tls_context *tls_ctx, 697 struct sock *sk, u32 seq, u8 *rcd_sn) 698{ 699 struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx); 700 struct net_device *netdev; 701 702 trace_tls_device_rx_resync_send(sk, seq, rcd_sn, rx_ctx->resync_type); 703 rcu_read_lock(); 704 netdev = rcu_dereference(tls_ctx->netdev); 705 if (netdev) 706 netdev->tlsdev_ops->tls_dev_resync(netdev, sk, seq, rcd_sn, 707 TLS_OFFLOAD_CTX_DIR_RX); 708 rcu_read_unlock(); 709 TLS_INC_STATS(sock_net(sk), LINUX_MIB_TLSRXDEVICERESYNC); 710} 711 712static bool 713tls_device_rx_resync_async(struct tls_offload_resync_async *resync_async, 714 s64 resync_req, u32 *seq, u16 *rcd_delta) 715{ 716 u32 is_async = resync_req & RESYNC_REQ_ASYNC; 717 u32 req_seq = resync_req >> 32; 718 u32 req_end = req_seq + ((resync_req >> 16) & 0xffff); 719 u16 i; 720 721 *rcd_delta = 0; 722 723 if (is_async) { 724 /* shouldn't get to wraparound: 725 * too long in async stage, something bad happened 726 */ 727 if (WARN_ON_ONCE(resync_async->rcd_delta == USHRT_MAX)) 728 return false; 729 730 /* asynchronous stage: log all headers seq such that 731 * req_seq <= seq <= end_seq, and wait for real resync request 732 */ 733 if (before(*seq, req_seq)) 734 return false; 735 if (!after(*seq, req_end) && 736 resync_async->loglen < TLS_DEVICE_RESYNC_ASYNC_LOGMAX) 737 resync_async->log[resync_async->loglen++] = *seq; 738 739 resync_async->rcd_delta++; 740 741 return false; 742 } 743 744 /* synchronous stage: check against the logged entries and 745 * proceed to check the next entries if no match was found 746 */ 747 for (i = 0; i < resync_async->loglen; i++) 748 if (req_seq == resync_async->log[i] && 749 atomic64_try_cmpxchg(&resync_async->req, &resync_req, 0)) { 750 *rcd_delta = resync_async->rcd_delta - i; 751 *seq = req_seq; 752 resync_async->loglen = 0; 753 resync_async->rcd_delta = 0; 754 return true; 755 } 756 757 resync_async->loglen = 0; 758 resync_async->rcd_delta = 0; 759 760 if (req_seq == *seq && 761 atomic64_try_cmpxchg(&resync_async->req, 762 &resync_req, 0)) 763 return true; 764 765 return false; 766} 767 768void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) 769{ 770 struct tls_context *tls_ctx = tls_get_ctx(sk); 771 struct tls_offload_context_rx *rx_ctx; 772 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; 773 u32 sock_data, is_req_pending; 774 struct tls_prot_info *prot; 775 s64 resync_req; 776 u16 rcd_delta; 777 u32 req_seq; 778 779 if (tls_ctx->rx_conf != TLS_HW) 780 return; 781 if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) 782 return; 783 784 prot = &tls_ctx->prot_info; 785 rx_ctx = tls_offload_ctx_rx(tls_ctx); 786 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); 787 788 switch (rx_ctx->resync_type) { 789 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ: 790 resync_req = atomic64_read(&rx_ctx->resync_req); 791 req_seq = resync_req >> 32; 792 seq += TLS_HEADER_SIZE - 1; 793 is_req_pending = resync_req; 794 795 if (likely(!is_req_pending) || req_seq != seq || 796 !atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) 797 return; 798 break; 799 case TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT: 800 if (likely(!rx_ctx->resync_nh_do_now)) 801 return; 802 803 /* head of next rec is already in, note that the sock_inq will 804 * include the currently parsed message when called from parser 805 */ 806 sock_data = tcp_inq(sk); 807 if (sock_data > rcd_len) { 808 trace_tls_device_rx_resync_nh_delay(sk, sock_data, 809 rcd_len); 810 return; 811 } 812 813 rx_ctx->resync_nh_do_now = 0; 814 seq += rcd_len; 815 tls_bigint_increment(rcd_sn, prot->rec_seq_size); 816 break; 817 case TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ_ASYNC: 818 resync_req = atomic64_read(&rx_ctx->resync_async->req); 819 is_req_pending = resync_req; 820 if (likely(!is_req_pending)) 821 return; 822 823 if (!tls_device_rx_resync_async(rx_ctx->resync_async, 824 resync_req, &seq, &rcd_delta)) 825 return; 826 tls_bigint_subtract(rcd_sn, rcd_delta); 827 break; 828 } 829 830 tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn); 831} 832 833static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx, 834 struct tls_offload_context_rx *ctx, 835 struct sock *sk, struct sk_buff *skb) 836{ 837 struct strp_msg *rxm; 838 839 /* device will request resyncs by itself based on stream scan */ 840 if (ctx->resync_type != TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT) 841 return; 842 /* already scheduled */ 843 if (ctx->resync_nh_do_now) 844 return; 845 /* seen decrypted fragments since last fully-failed record */ 846 if (ctx->resync_nh_reset) { 847 ctx->resync_nh_reset = 0; 848 ctx->resync_nh.decrypted_failed = 1; 849 ctx->resync_nh.decrypted_tgt = TLS_DEVICE_RESYNC_NH_START_IVAL; 850 return; 851 } 852 853 if (++ctx->resync_nh.decrypted_failed <= ctx->resync_nh.decrypted_tgt) 854 return; 855 856 /* doing resync, bump the next target in case it fails */ 857 if (ctx->resync_nh.decrypted_tgt < TLS_DEVICE_RESYNC_NH_MAX_IVAL) 858 ctx->resync_nh.decrypted_tgt *= 2; 859 else 860 ctx->resync_nh.decrypted_tgt += TLS_DEVICE_RESYNC_NH_MAX_IVAL; 861 862 rxm = strp_msg(skb); 863 864 /* head of next rec is already in, parser will sync for us */ 865 if (tcp_inq(sk) > rxm->full_len) { 866 trace_tls_device_rx_resync_nh_schedule(sk); 867 ctx->resync_nh_do_now = 1; 868 } else { 869 struct tls_prot_info *prot = &tls_ctx->prot_info; 870 u8 rcd_sn[TLS_MAX_REC_SEQ_SIZE]; 871 872 memcpy(rcd_sn, tls_ctx->rx.rec_seq, prot->rec_seq_size); 873 tls_bigint_increment(rcd_sn, prot->rec_seq_size); 874 875 tls_device_resync_rx(tls_ctx, sk, tcp_sk(sk)->copied_seq, 876 rcd_sn); 877 } 878} 879 880static int 881tls_device_reencrypt(struct sock *sk, struct tls_context *tls_ctx) 882{ 883 struct tls_sw_context_rx *sw_ctx = tls_sw_ctx_rx(tls_ctx); 884 const struct tls_cipher_desc *cipher_desc; 885 int err, offset, copy, data_len, pos; 886 struct sk_buff *skb, *skb_iter; 887 struct scatterlist sg[1]; 888 struct strp_msg *rxm; 889 char *orig_buf, *buf; 890 891 cipher_desc = get_cipher_desc(tls_ctx->crypto_recv.info.cipher_type); 892 DEBUG_NET_WARN_ON_ONCE(!cipher_desc || !cipher_desc->offloadable); 893 894 rxm = strp_msg(tls_strp_msg(sw_ctx)); 895 orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + cipher_desc->iv, 896 sk->sk_allocation); 897 if (!orig_buf) 898 return -ENOMEM; 899 buf = orig_buf; 900 901 err = tls_strp_msg_cow(sw_ctx); 902 if (unlikely(err)) 903 goto free_buf; 904 905 skb = tls_strp_msg(sw_ctx); 906 rxm = strp_msg(skb); 907 offset = rxm->offset; 908 909 sg_init_table(sg, 1); 910 sg_set_buf(&sg[0], buf, 911 rxm->full_len + TLS_HEADER_SIZE + cipher_desc->iv); 912 err = skb_copy_bits(skb, offset, buf, TLS_HEADER_SIZE + cipher_desc->iv); 913 if (err) 914 goto free_buf; 915 916 /* We are interested only in the decrypted data not the auth */ 917 err = decrypt_skb(sk, sg); 918 if (err != -EBADMSG) 919 goto free_buf; 920 else 921 err = 0; 922 923 data_len = rxm->full_len - cipher_desc->tag; 924 925 if (skb_pagelen(skb) > offset) { 926 copy = min_t(int, skb_pagelen(skb) - offset, data_len); 927 928 if (skb->decrypted) { 929 err = skb_store_bits(skb, offset, buf, copy); 930 if (err) 931 goto free_buf; 932 } 933 934 offset += copy; 935 buf += copy; 936 } 937 938 pos = skb_pagelen(skb); 939 skb_walk_frags(skb, skb_iter) { 940 int frag_pos; 941 942 /* Practically all frags must belong to msg if reencrypt 943 * is needed with current strparser and coalescing logic, 944 * but strparser may "get optimized", so let's be safe. 945 */ 946 if (pos + skb_iter->len <= offset) 947 goto done_with_frag; 948 if (pos >= data_len + rxm->offset) 949 break; 950 951 frag_pos = offset - pos; 952 copy = min_t(int, skb_iter->len - frag_pos, 953 data_len + rxm->offset - offset); 954 955 if (skb_iter->decrypted) { 956 err = skb_store_bits(skb_iter, frag_pos, buf, copy); 957 if (err) 958 goto free_buf; 959 } 960 961 offset += copy; 962 buf += copy; 963done_with_frag: 964 pos += skb_iter->len; 965 } 966 967free_buf: 968 kfree(orig_buf); 969 return err; 970} 971 972int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx) 973{ 974 struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx); 975 struct tls_sw_context_rx *sw_ctx = tls_sw_ctx_rx(tls_ctx); 976 struct sk_buff *skb = tls_strp_msg(sw_ctx); 977 struct strp_msg *rxm = strp_msg(skb); 978 int is_decrypted, is_encrypted; 979 980 if (!tls_strp_msg_mixed_decrypted(sw_ctx)) { 981 is_decrypted = skb->decrypted; 982 is_encrypted = !is_decrypted; 983 } else { 984 is_decrypted = 0; 985 is_encrypted = 0; 986 } 987 988 trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len, 989 tls_ctx->rx.rec_seq, rxm->full_len, 990 is_encrypted, is_decrypted); 991 992 if (unlikely(test_bit(TLS_RX_DEV_DEGRADED, &tls_ctx->flags))) { 993 if (likely(is_encrypted || is_decrypted)) 994 return is_decrypted; 995 996 /* After tls_device_down disables the offload, the next SKB will 997 * likely have initial fragments decrypted, and final ones not 998 * decrypted. We need to reencrypt that single SKB. 999 */ 1000 return tls_device_reencrypt(sk, tls_ctx); 1001 } 1002 1003 /* Return immediately if the record is either entirely plaintext or 1004 * entirely ciphertext. Otherwise handle reencrypt partially decrypted 1005 * record. 1006 */ 1007 if (is_decrypted) { 1008 ctx->resync_nh_reset = 1; 1009 return is_decrypted; 1010 } 1011 if (is_encrypted) { 1012 tls_device_core_ctrl_rx_resync(tls_ctx, ctx, sk, skb); 1013 return 0; 1014 } 1015 1016 ctx->resync_nh_reset = 1; 1017 return tls_device_reencrypt(sk, tls_ctx); 1018} 1019 1020static void tls_device_attach(struct tls_context *ctx, struct sock *sk, 1021 struct net_device *netdev) 1022{ 1023 if (sk->sk_destruct != tls_device_sk_destruct) { 1024 refcount_set(&ctx->refcount, 1); 1025 dev_hold(netdev); 1026 RCU_INIT_POINTER(ctx->netdev, netdev); 1027 spin_lock_irq(&tls_device_lock); 1028 list_add_tail(&ctx->list, &tls_device_list); 1029 spin_unlock_irq(&tls_device_lock); 1030 1031 ctx->sk_destruct = sk->sk_destruct; 1032 smp_store_release(&sk->sk_destruct, tls_device_sk_destruct); 1033 } 1034} 1035 1036static struct tls_offload_context_tx *alloc_offload_ctx_tx(struct tls_context *ctx) 1037{ 1038 struct tls_offload_context_tx *offload_ctx; 1039 __be64 rcd_sn; 1040 1041 offload_ctx = kzalloc(sizeof(*offload_ctx), GFP_KERNEL); 1042 if (!offload_ctx) 1043 return NULL; 1044 1045 INIT_WORK(&offload_ctx->destruct_work, tls_device_tx_del_task); 1046 INIT_LIST_HEAD(&offload_ctx->records_list); 1047 spin_lock_init(&offload_ctx->lock); 1048 sg_init_table(offload_ctx->sg_tx_data, 1049 ARRAY_SIZE(offload_ctx->sg_tx_data)); 1050 1051 /* start at rec_seq - 1 to account for the start marker record */ 1052 memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn)); 1053 offload_ctx->unacked_record_sn = be64_to_cpu(rcd_sn) - 1; 1054 1055 offload_ctx->ctx = ctx; 1056 1057 return offload_ctx; 1058} 1059 1060int tls_set_device_offload(struct sock *sk) 1061{ 1062 struct tls_record_info *start_marker_record; 1063 struct tls_offload_context_tx *offload_ctx; 1064 const struct tls_cipher_desc *cipher_desc; 1065 struct tls_crypto_info *crypto_info; 1066 struct tls_prot_info *prot; 1067 struct net_device *netdev; 1068 struct tls_context *ctx; 1069 struct sk_buff *skb; 1070 char *iv, *rec_seq; 1071 int rc; 1072 1073 ctx = tls_get_ctx(sk); 1074 prot = &ctx->prot_info; 1075 1076 if (ctx->priv_ctx_tx) 1077 return -EEXIST; 1078 1079 netdev = get_netdev_for_sock(sk); 1080 if (!netdev) { 1081 pr_err_ratelimited("%s: netdev not found\n", __func__); 1082 return -EINVAL; 1083 } 1084 1085 if (!(netdev->features & NETIF_F_HW_TLS_TX)) { 1086 rc = -EOPNOTSUPP; 1087 goto release_netdev; 1088 } 1089 1090 crypto_info = &ctx->crypto_send.info; 1091 if (crypto_info->version != TLS_1_2_VERSION) { 1092 rc = -EOPNOTSUPP; 1093 goto release_netdev; 1094 } 1095 1096 cipher_desc = get_cipher_desc(crypto_info->cipher_type); 1097 if (!cipher_desc || !cipher_desc->offloadable) { 1098 rc = -EINVAL; 1099 goto release_netdev; 1100 } 1101 1102 rc = init_prot_info(prot, crypto_info, cipher_desc); 1103 if (rc) 1104 goto release_netdev; 1105 1106 iv = crypto_info_iv(crypto_info, cipher_desc); 1107 rec_seq = crypto_info_rec_seq(crypto_info, cipher_desc); 1108 1109 memcpy(ctx->tx.iv + cipher_desc->salt, iv, cipher_desc->iv); 1110 memcpy(ctx->tx.rec_seq, rec_seq, cipher_desc->rec_seq); 1111 1112 start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL); 1113 if (!start_marker_record) { 1114 rc = -ENOMEM; 1115 goto release_netdev; 1116 } 1117 1118 offload_ctx = alloc_offload_ctx_tx(ctx); 1119 if (!offload_ctx) { 1120 rc = -ENOMEM; 1121 goto free_marker_record; 1122 } 1123 1124 rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info); 1125 if (rc) 1126 goto free_offload_ctx; 1127 1128 start_marker_record->end_seq = tcp_sk(sk)->write_seq; 1129 start_marker_record->len = 0; 1130 start_marker_record->num_frags = 0; 1131 list_add_tail(&start_marker_record->list, &offload_ctx->records_list); 1132 1133 clean_acked_data_enable(inet_csk(sk), &tls_icsk_clean_acked); 1134 ctx->push_pending_record = tls_device_push_pending_record; 1135 1136 /* TLS offload is greatly simplified if we don't send 1137 * SKBs where only part of the payload needs to be encrypted. 1138 * So mark the last skb in the write queue as end of record. 1139 */ 1140 skb = tcp_write_queue_tail(sk); 1141 if (skb) 1142 TCP_SKB_CB(skb)->eor = 1; 1143 1144 /* Avoid offloading if the device is down 1145 * We don't want to offload new flows after 1146 * the NETDEV_DOWN event 1147 * 1148 * device_offload_lock is taken in tls_devices's NETDEV_DOWN 1149 * handler thus protecting from the device going down before 1150 * ctx was added to tls_device_list. 1151 */ 1152 down_read(&device_offload_lock); 1153 if (!(netdev->flags & IFF_UP)) { 1154 rc = -EINVAL; 1155 goto release_lock; 1156 } 1157 1158 ctx->priv_ctx_tx = offload_ctx; 1159 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_TX, 1160 &ctx->crypto_send.info, 1161 tcp_sk(sk)->write_seq); 1162 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_TX, 1163 tcp_sk(sk)->write_seq, rec_seq, rc); 1164 if (rc) 1165 goto release_lock; 1166 1167 tls_device_attach(ctx, sk, netdev); 1168 up_read(&device_offload_lock); 1169 1170 /* following this assignment tls_is_skb_tx_device_offloaded 1171 * will return true and the context might be accessed 1172 * by the netdev's xmit function. 1173 */ 1174 smp_store_release(&sk->sk_validate_xmit_skb, tls_validate_xmit_skb); 1175 dev_put(netdev); 1176 1177 return 0; 1178 1179release_lock: 1180 up_read(&device_offload_lock); 1181 clean_acked_data_disable(inet_csk(sk)); 1182 crypto_free_aead(offload_ctx->aead_send); 1183free_offload_ctx: 1184 kfree(offload_ctx); 1185 ctx->priv_ctx_tx = NULL; 1186free_marker_record: 1187 kfree(start_marker_record); 1188release_netdev: 1189 dev_put(netdev); 1190 return rc; 1191} 1192 1193int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx) 1194{ 1195 struct tls12_crypto_info_aes_gcm_128 *info; 1196 struct tls_offload_context_rx *context; 1197 struct net_device *netdev; 1198 int rc = 0; 1199 1200 if (ctx->crypto_recv.info.version != TLS_1_2_VERSION) 1201 return -EOPNOTSUPP; 1202 1203 netdev = get_netdev_for_sock(sk); 1204 if (!netdev) { 1205 pr_err_ratelimited("%s: netdev not found\n", __func__); 1206 return -EINVAL; 1207 } 1208 1209 if (!(netdev->features & NETIF_F_HW_TLS_RX)) { 1210 rc = -EOPNOTSUPP; 1211 goto release_netdev; 1212 } 1213 1214 /* Avoid offloading if the device is down 1215 * We don't want to offload new flows after 1216 * the NETDEV_DOWN event 1217 * 1218 * device_offload_lock is taken in tls_devices's NETDEV_DOWN 1219 * handler thus protecting from the device going down before 1220 * ctx was added to tls_device_list. 1221 */ 1222 down_read(&device_offload_lock); 1223 if (!(netdev->flags & IFF_UP)) { 1224 rc = -EINVAL; 1225 goto release_lock; 1226 } 1227 1228 context = kzalloc(sizeof(*context), GFP_KERNEL); 1229 if (!context) { 1230 rc = -ENOMEM; 1231 goto release_lock; 1232 } 1233 context->resync_nh_reset = 1; 1234 1235 ctx->priv_ctx_rx = context; 1236 rc = tls_set_sw_offload(sk, 0); 1237 if (rc) 1238 goto release_ctx; 1239 1240 rc = netdev->tlsdev_ops->tls_dev_add(netdev, sk, TLS_OFFLOAD_CTX_DIR_RX, 1241 &ctx->crypto_recv.info, 1242 tcp_sk(sk)->copied_seq); 1243 info = (void *)&ctx->crypto_recv.info; 1244 trace_tls_device_offload_set(sk, TLS_OFFLOAD_CTX_DIR_RX, 1245 tcp_sk(sk)->copied_seq, info->rec_seq, rc); 1246 if (rc) 1247 goto free_sw_resources; 1248 1249 tls_device_attach(ctx, sk, netdev); 1250 up_read(&device_offload_lock); 1251 1252 dev_put(netdev); 1253 1254 return 0; 1255 1256free_sw_resources: 1257 up_read(&device_offload_lock); 1258 tls_sw_free_resources_rx(sk); 1259 down_read(&device_offload_lock); 1260release_ctx: 1261 ctx->priv_ctx_rx = NULL; 1262release_lock: 1263 up_read(&device_offload_lock); 1264release_netdev: 1265 dev_put(netdev); 1266 return rc; 1267} 1268 1269void tls_device_offload_cleanup_rx(struct sock *sk) 1270{ 1271 struct tls_context *tls_ctx = tls_get_ctx(sk); 1272 struct net_device *netdev; 1273 1274 down_read(&device_offload_lock); 1275 netdev = rcu_dereference_protected(tls_ctx->netdev, 1276 lockdep_is_held(&device_offload_lock)); 1277 if (!netdev) 1278 goto out; 1279 1280 netdev->tlsdev_ops->tls_dev_del(netdev, tls_ctx, 1281 TLS_OFFLOAD_CTX_DIR_RX); 1282 1283 if (tls_ctx->tx_conf != TLS_HW) { 1284 dev_put(netdev); 1285 rcu_assign_pointer(tls_ctx->netdev, NULL); 1286 } else { 1287 set_bit(TLS_RX_DEV_CLOSED, &tls_ctx->flags); 1288 } 1289out: 1290 up_read(&device_offload_lock); 1291 tls_sw_release_resources_rx(sk); 1292} 1293 1294static int tls_device_down(struct net_device *netdev) 1295{ 1296 struct tls_context *ctx, *tmp; 1297 unsigned long flags; 1298 LIST_HEAD(list); 1299 1300 /* Request a write lock to block new offload attempts */ 1301 down_write(&device_offload_lock); 1302 1303 spin_lock_irqsave(&tls_device_lock, flags); 1304 list_for_each_entry_safe(ctx, tmp, &tls_device_list, list) { 1305 struct net_device *ctx_netdev = 1306 rcu_dereference_protected(ctx->netdev, 1307 lockdep_is_held(&device_offload_lock)); 1308 1309 if (ctx_netdev != netdev || 1310 !refcount_inc_not_zero(&ctx->refcount)) 1311 continue; 1312 1313 list_move(&ctx->list, &list); 1314 } 1315 spin_unlock_irqrestore(&tls_device_lock, flags); 1316 1317 list_for_each_entry_safe(ctx, tmp, &list, list) { 1318 /* Stop offloaded TX and switch to the fallback. 1319 * tls_is_skb_tx_device_offloaded will return false. 1320 */ 1321 WRITE_ONCE(ctx->sk->sk_validate_xmit_skb, tls_validate_xmit_skb_sw); 1322 1323 /* Stop the RX and TX resync. 1324 * tls_dev_resync must not be called after tls_dev_del. 1325 */ 1326 rcu_assign_pointer(ctx->netdev, NULL); 1327 1328 /* Start skipping the RX resync logic completely. */ 1329 set_bit(TLS_RX_DEV_DEGRADED, &ctx->flags); 1330 1331 /* Sync with inflight packets. After this point: 1332 * TX: no non-encrypted packets will be passed to the driver. 1333 * RX: resync requests from the driver will be ignored. 1334 */ 1335 synchronize_net(); 1336 1337 /* Release the offload context on the driver side. */ 1338 if (ctx->tx_conf == TLS_HW) 1339 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, 1340 TLS_OFFLOAD_CTX_DIR_TX); 1341 if (ctx->rx_conf == TLS_HW && 1342 !test_bit(TLS_RX_DEV_CLOSED, &ctx->flags)) 1343 netdev->tlsdev_ops->tls_dev_del(netdev, ctx, 1344 TLS_OFFLOAD_CTX_DIR_RX); 1345 1346 dev_put(netdev); 1347 1348 /* Move the context to a separate list for two reasons: 1349 * 1. When the context is deallocated, list_del is called. 1350 * 2. It's no longer an offloaded context, so we don't want to 1351 * run offload-specific code on this context. 1352 */ 1353 spin_lock_irqsave(&tls_device_lock, flags); 1354 list_move_tail(&ctx->list, &tls_device_down_list); 1355 spin_unlock_irqrestore(&tls_device_lock, flags); 1356 1357 /* Device contexts for RX and TX will be freed in on sk_destruct 1358 * by tls_device_free_ctx. rx_conf and tx_conf stay in TLS_HW. 1359 * Now release the ref taken above. 1360 */ 1361 if (refcount_dec_and_test(&ctx->refcount)) { 1362 /* sk_destruct ran after tls_device_down took a ref, and 1363 * it returned early. Complete the destruction here. 1364 */ 1365 list_del(&ctx->list); 1366 tls_device_free_ctx(ctx); 1367 } 1368 } 1369 1370 up_write(&device_offload_lock); 1371 1372 flush_workqueue(destruct_wq); 1373 1374 return NOTIFY_DONE; 1375} 1376 1377static int tls_dev_event(struct notifier_block *this, unsigned long event, 1378 void *ptr) 1379{ 1380 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1381 1382 if (!dev->tlsdev_ops && 1383 !(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) 1384 return NOTIFY_DONE; 1385 1386 switch (event) { 1387 case NETDEV_REGISTER: 1388 case NETDEV_FEAT_CHANGE: 1389 if (netif_is_bond_master(dev)) 1390 return NOTIFY_DONE; 1391 if ((dev->features & NETIF_F_HW_TLS_RX) && 1392 !dev->tlsdev_ops->tls_dev_resync) 1393 return NOTIFY_BAD; 1394 1395 if (dev->tlsdev_ops && 1396 dev->tlsdev_ops->tls_dev_add && 1397 dev->tlsdev_ops->tls_dev_del) 1398 return NOTIFY_DONE; 1399 else 1400 return NOTIFY_BAD; 1401 case NETDEV_DOWN: 1402 return tls_device_down(dev); 1403 } 1404 return NOTIFY_DONE; 1405} 1406 1407static struct notifier_block tls_dev_notifier = { 1408 .notifier_call = tls_dev_event, 1409}; 1410 1411int __init tls_device_init(void) 1412{ 1413 int err; 1414 1415 dummy_page = alloc_page(GFP_KERNEL); 1416 if (!dummy_page) 1417 return -ENOMEM; 1418 1419 destruct_wq = alloc_workqueue("ktls_device_destruct", 0, 0); 1420 if (!destruct_wq) { 1421 err = -ENOMEM; 1422 goto err_free_dummy; 1423 } 1424 1425 err = register_netdevice_notifier(&tls_dev_notifier); 1426 if (err) 1427 goto err_destroy_wq; 1428 1429 return 0; 1430 1431err_destroy_wq: 1432 destroy_workqueue(destruct_wq); 1433err_free_dummy: 1434 put_page(dummy_page); 1435 return err; 1436} 1437 1438void __exit tls_device_cleanup(void) 1439{ 1440 unregister_netdevice_notifier(&tls_dev_notifier); 1441 destroy_workqueue(destruct_wq); 1442 clean_acked_data_flush(); 1443 put_page(dummy_page); 1444} 1445